Studies of an intramolecular Diels-Alder approach to the nargenicins: involvement of boatlike transition states in the cyclizations of substituted 1,7,9-decatrien-3-ones
Practical synthesis of diastereomerically and enantiomerically pure 2-methyl 1,3-diols from (R)-2,3,O-isopropylideneglyceraldehyde. Application to the C(1)-C(7) and C(9)-C(12) fragments of erythronolide B